Slicing arrays by specified slice size

Array+Sliced.swift

import Foundation

extension Array where Element: Any {

    func sliced(sliceSize: Int) -> [[Element]] {
        
        var result = [[Element]]()
        guard count > 0 else { return result }
        let slicesCount = Int(ceil(Double(count) / Double(sliceSize)))
        
        for i in 1...slicesCount {
            var startIndex = 0
            if i > 1 {
                startIndex = ((i - 1) * sliceSize)
            }
            var endIndex = (sliceSize * i) - 1
            if endIndex > count - 1 {
                endIndex = count - 1
            }
            result.append(Array(self[startIndex...endIndex]))
        }
        return result
    }
}

Usage:

let array = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]
print(array.sliced(sliceSize: 5))
// [[0, 1, 2, 3, 4], [5, 6, 7, 8, 9], [10, 11, 12, 13, 14], [15, 16]]